Transmission-tower.



Ft MQBQWMAN & A. H. BOVARD'. TRANSMISSION TOWER.

- AAAAAAAAAAAAAAAAA PR. 111111 0. 1,057,216. Patented Mar. 25, 1913.

' 2 SSSSSSSSSSSS 1.

FIGJ. n62.

-WiTNESSES, HA INVENTORS, A \ra/4 F.. M. BOWMAN & A. H. BOVARD,TRANSMISSION TOWER.

APPLICATION FILED APR 1 1,057,216. 4'1910' Pa e e Mar-25, 1913.

2 SHEETS-*SHEET 2.

WITNESSES, 569W N T D sTAtrnsrArENr OFFICE.

FRANK M. BQWIVIAN, OF BELLEVUE, AND ALEXANDER H. BOVARD, OF PITTSBUBQ E,PENNSYLVANIA, ASSIGNORS ".IEO RITER-CONLEY MANUFACTURING COMPANY. 8FPITTSBURGH, PENNSYLVANIA, A CORPORATION OF NEW JERSEY.

TRANSMISSION-TOWER.

To all whom it may concern:

Be it known that we, FRANK M. BowMAN and ALEXANDER H. BovARn, residents,re-

spectively, of Bellevueyand Pittsburgh, in

the county ofAllegheny and State of Penn sylvania, have invented certainnew and useful Improvements 1n 'TlfiIlSHllSSlOIP' a specisigned tosupport electrical transmission wires or cables.

shown 'in' the accompanying drawings and as preferred, our towereomprisesa tapersv ing pyramidal skeleton steel structure hav: ing fourmain upwardly converging corner; posts and a cross memberxdesigned for,car-g rying any desired voltage arranged in two;

phases and each; phase compris1ng; three conductor, W1res.-

An objec't'ofour inventionis to provide a tower of the character.mentioneyl -i n which" the four faces of the towerjare ofltriangularform and of substantiallyithe' same-di mensions and means for/supportingall of the wires thereon outside :oi rthiepcorner posts, therebyproviding a tower combining v a maximum of strength withamininium ofmaterial. o i i v 1 v A further object of the. presentj'invention.

is" to provide v new; and. -improvd' -means ed 1 acting with the towerproper for supporting the wires of the respective phases.

A Still "further object v-of our invention is.

to provide a constructioninwhichlthe cross arm or cross-armsofthefto'wer are subjected" to substantially no torsional. stresses andin which the load of the 11 per' wirev offeach' triangularly arranged pass or circuit is not carried by the cross-arm or-cross-arms of thetower.

In the accompanying drawings, which illustrate an application of ourinvention, .Fi

re 1, is an elevational view of a tower em odying ourinvention; Fig. 2,a similar view taken at right angles to the view of Fig. 1; Fig. 3, across-sectional view taken on line III-III ofFig. 1; and Fig. 4,

an enlarged perspective view of the upper portion of the tower.

Specification of Letters Patent.

Application filed April 1.4, 1916.

Patented Mar. 25, 1913.

Eerial No. 555,486.

Referring to the; drawings and as preferred our tower comprises fourcorner- -posts 2, 7 preferably. formed of angle-bars whichflarewsccured, at their lower endsftof legs 3f securely anchored in: the"'ground by suitable anchor-plates 45, The lower ends of: the cornerposts are spaced equidistant apart and. converge. upwardlystraightlinesforming a. pyramldal structure having:

four triangular .faces of substantially the same dimensions. The fourcorner Jposts' of the: tower ,are connectedat suitably 'spaced -i11tervals- .by' horizontally disposed g I a bracing .membersf5, asarti'cularly shown In, the embodiment of ou invention as";

by; Fig;- 3. I In the towerillustrated we have shown three sets of;these;memberslindicated b theletters a,-'Ib, and "In: the horizontal panes of the lower sett e we-employ diagonal' brace-bars 6 extendinginwardly from." the';fourlposts and meetingfat'andsecured I seriesja'are preferably connected by; cross- 1 members 8, while in theintermediate or'. set

toa'plate 7 The brace bars 5 or, the-set or v b we dispense with saidmembers 6- and -8 andemploy only the bracesr 5. In the 11 per series aweextend two of the bars '5" orga. ,Q

- distance outside of two of thecorner posts and utilize this combined.cross-arm' and bracing construction for the support, of telephone wires.The corner posts of thetower.

are further connected between thejadjacent 'sets 6 and c, a and b,' andbetween a andthe grou'nd. Thus, between the ground and the A lowerbraces ,5 viwe provide on each face angle-bars or webs 9 extending fromthe m embers 13 projecting upwardly and outwardlyfrom the plates 10;:and between the intermediate and upperbrace-ba'rs 5 we employ forconnecting the posts, members14.'

The converging upper ends of the corner posts are connected by means ofmembers 15 Qbarsh-the posts are connected byvmeans of andyld, and saidmembers, 15 areconnected with a cross-arm 17. In the drawin s, wehave'shown agsingle cross-arm pre erably of channel .form which extendsthrough the tower and projects for a considerable dis tancefl'from twofaces thereof. Crossarm 17 ends of the corner posts by means of theangle-bars'15 and the portions thereof lying outside of the tower aresupported by a cantaliver construction in the form of a bracket composedof a combination of triangles. This cantaliver bracket constructionconstitutes an important and characteristic feature of our invention forit enables us to transmit the loads and stresses directly to the towerand relieves the cross-arm thereof.

The three wires of each circuit as illustrated are carried on pins 18and these pins are arranged in the form of a. triangle, preferably anequilateral triangle, with all of the pins located outside of the fourcorner posts of'the tower. The two lower pins of each circuitare securedto the cross-arm'17, and the upper pin is carried by a mast preferablyformed of two upwardly converging members19 mounted on and secured tooutwardly extending members 20 constituting a part of the cantaliverbracket construction. Mem- .bers 19 are preferably of channel form andstraddle the cross-arm 17 and are preferably tied together and to-thecross-arm by a member 21. In addition to the members 20 i which enterinto the construction of one of diagonal members 25.

"the triangles of the cantaliver bracket, we provide members 22 and 23respectively arranged in connection with a brace-bar 5 of the upper setof horizontal braces and with a'member 24: to form two othertriangularly shaped figures. We have indicated the trianets by means ofthe letters 6, f, and g, and

gles entering into the formation of the brackhave shown the largesttriangle 0 braced by By this cantaliver 1 construction the loads andstresses-instead of 401 gjar carried by the triangular bracing and bysaid bracin being carried by the cross-arm or cross-arms transmitted tothe tower proper. It wil be noted that'the load, in

the direction of the upper wire of each phase,

is carried by the two members 19 alternately in tension and compression,depending upon the direction of the load on-said wire, and

1 that the stresses are carried by these two members to the cantaliverbracket and thence to the tower. It will be further noted that thestresses produced by the lower transmission wires of each circuit willbe directly transmitted to the tower proper by the said triangularlyarranged members. 7

- In towers of this character it is usual to provide. means for carryingand supporting a. ground wire and for this purpose we have provided asuperposed skeleton structure comprising four corner posts 26 secured toand extending upwardly from the corner posts of the tower proper. This uper structure corresponds to and is in eifiact 'a con tinuatio'n of thepyramidal main tower so that the structure as a whole comprises fourtriangular faces extending from the points of anchorage at the bottom tothe ground wire connection at the top. The corner posts of thesuperposed structure or ground wire mast are suitably joined together attheir convergin upper ends by any suitable means, sudh for example, asclamping means similar to the clamping means 27 of the members 19; andthe corner posts 26 are braced by members 28.

What we claim is:

1. In a skeleton tower construction, the combination with a tower, of across-arm projecting therefrom, a mast, and a cantaliver bracketconstruction for supporting the cross-arm and mast comprising two pairsof members each secured to two corner posts of the tower insubstantially the same horizontal plane and extending therefrom to thecross-arm.

2. In a skeleton tower construction, the combination with a tower, of across arm projecting therefrom, a mast comprising two convergingmembers, and a cantaliver bracket construction for supporting thecross-arm and mast comprising two pairs of members each secured to twocorner posts of the tower in substantially the same horizontal plane andextending therefrom to the cross-arm.

3. In a skeleton tower construction, the combination with a tower, of across-arm projecting therefrom, a mast comprising two convergingmembers, and a cantaliver bracket construction for supporting thecross-arm and mast comprising two pairs of members each secured to twocorner posts of the tower in substantially the same horizontal plane andextending therefrom to the cross-arm, said mast secured to one of thepairs of members and extending above the cross-arm.

, 4. In a skeleton tower construction, the combination, with a tower, ofa cross-arm projecting therefrom, and a cantaliver bracket constructionfor supporting the cross-arm comprising a pair of members secured to twocorner posts of the tower and extending therefrom to an end of thecrossarm, a second pair of members secured to the said corner posts insubstantially the same horizontal plane as the first mentioned pair ofmembers and extending therefrom to the cross-arm at a point intermediatean end of the cross-arm and the tower.

5. In a skeleton tower construction, the combination with a tower, of across-arm projecting therefrom, a mast, and a cantaliver bracketconstruction for supporting the cross-arm and mast comprising a pair ofmembers secured to two corner posts of the tower and extending therefromto an end of the cross-arm, a second pair of members secured to the saidcorner posts in substantially the same horizontal plane as the firstmentioned pair of members and extending therefrom to the cross-arm at a.point intermediate an end of the cross-arm and the'tower.

6. In a skeleton tower construction, the

combination with a tower, of a cross-arm projecting. therefrom, and acantaliver bracket construction for supporting the cross-arm comprisinga pair of members secured to two corner posts of the tower and extendingtherefrom to an end of the crossarm,.diagonal members connecting saidpair of members, and a second pair of members secured to the said cornerposts in substantially the same horizontal plane as the, first mentionedpair of members and extendingtherefrom to the cross-arm at a pointintermediate an end of the cross-arm and the tower.

7. In a skeleton tower construction, the combination with a tower, of-a,cross-arm projecting therefrom, a most, and a cantaliver bracketconstruction for supporting the cross-arm and mast comprising a pair01'" members secured to two corner posts of the tower and extendingtherefrom to an end of the cross-arm, diagonal members connecting saidpair of members; and a second pair of members secured to the said cornerposts insubstantielly the same horizontal plane as the first mentionedpair of members and extending therefromtothe.cross-arm at a pointintermediate an end of the cross-arm 'and the tower, said mast securedto the first mentioned painof members of the bracket.

Intestimony whereof We aflix our signatures in presence of twowitnesses? FRANK M. BOWMAN.

' ALEXANDER-II. BOVARD.

Witnessesw Y J. L. HAFNER,

A. C. WAY.

